. Human physiology : designed for colleges and the higher classes in schools, and for general reading. This experiment, which can be performed by any one, illustratesin a rude way the principle of the camera obscura. The realinstrument has a tube with a double convex lens, so as to collecttogether the rays from objects, and concentrate them upon asmall space, thereby making a very distinct small image ofthem. The eye is a very beautiful and perfect instrument ofthis sort. The space filled by the vitreous humor is the dark-ened room; the pupil answers to the hole in the window shut- 25* 294 . H
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. Human physiology : designed for colleges and the higher classes in schools, and for general reading. This experiment, which can be performed by any one, illustratesin a rude way the principle of the camera obscura. The realinstrument has a tube with a double convex lens, so as to collecttogether the rays from objects, and concentrate them upon asmall space, thereby making a very distinct small image ofthem. The eye is a very beautiful and perfect instrument ofthis sort. The space filled by the vitreous humor is the dark-ened room; the pupil answers to the hole in the window shut- 25* 294 . HUMAN PHYSIOLOGY. Cornea. Iris. Its radiated and circular muscular fibres. ter, or the tube of the more perfectly constructed camera; thecrystalline humor is the lens; and the retina is the screen onwhich the images are formed. We will now attend to the agency which the different partshave in producing the result, for which the apparatus is con-structed, observing the perfect adaptation of each of them tothe particular part which it performs in the process. 440. The cornea, as it lets in the light,